从一九七四年九月开始,进行了人造金刚石为主的小口径金刚石钻进试验。经过两年多的时间,在五个矿区对铁、硫、金等矿产进行了普查勘探。在小口径钻进中,我们主要使用了上海砂轮厂生产的人造金刚石孕镶钻头和聚晶螺旋扩孔器;并试用了南阳六○一厂、北京地质局修配厂、武汉探矿厂生产的人造金刚石孕镶钻头以及临潼东风电热 Starting from September 1974, a small diameter diamond drilling test based on artificial diamond was conducted. After more than two years, surveys of iron, sulfur, gold and other minerals were carried out in five mining areas. In the small-diameter drilling, we mainly use the artificial diamond inlaid drill bits and polycrystalline spiral reamers produced by Shanghai Grinding Wheel Factory. We also tried the trial of Nanyang 610 Factory, Beijing Geological Bureau’s repair factory and Wuhan Prospecting Factory Synthetic diamond impregnated drill and Lintong Dongfeng electric